package com.ax.business.common.util;

import java.beans.BeanInfo;
import java.beans.Introspector;
import java.beans.PropertyDescriptor;
import java.lang.reflect.InvocationTargetException;
import java.util.Map;
import java.beans.IntrospectionException;
import java.lang.reflect.Method;
import java.util.HashMap;

/**
 * @Author Lg
 * @Date 2018/9/6 10:17
 * @Content
 */
public class MapToBean {
        /**
         * 将一个 Map 对象转化为一个 JavaBean
         * @param clazz 要转化的类型
         * @param map 包含属性值的 map
         * @return 转化出来的 JavaBean 对象
         * @throws IntrospectionException 如果分析类属性失败
         * @throws IllegalAccessException 如果实例化 JavaBean 失败
         * @throws InstantiationException 如果实例化 JavaBean 失败
         * @throws InvocationTargetException 如果调用属性的 setter 方法失败
         */
        @SuppressWarnings("rawtypes")
        public static <T> T toBean(Class<T> clazz, Map map) {
            T obj = null;
            try {
                BeanInfo beanInfo = Introspector.getBeanInfo(clazz);
                obj = clazz.newInstance(); // 创建 JavaBean 对象

                // 给 JavaBean 对象的属性赋值
                PropertyDescriptor[] propertyDescriptors = beanInfo.getPropertyDescriptors();
                for (int i = 0; i < propertyDescriptors.length; i++) {
                    PropertyDescriptor descriptor = propertyDescriptors[i];
                    String propertyName = descriptor.getName();
                    if (map.containsKey(propertyName)) {
                        // 下面一句可以 try 起来，这样当一个属性赋值失败的时候就不会影响其他属性赋值。
                        Object value = map.get(propertyName);
                        if ("".equals(value)) {
                            value = null;
                        }
                        Object[] args = new Object[1];
                        args[0] = value;
                        try {
                            descriptor.getWriteMethod().invoke(obj, args);
                        } catch (InvocationTargetException e) {
                            System.out.println("字段映射失败");
                        }
                    }
                }
            } catch (IllegalAccessException e) {
                System.out.println("实例化 JavaBean 失败");
            } catch (IntrospectionException e) {
                System.out.println("分析类属性失败");
            } catch (IllegalArgumentException e) {
                System.out.println("映射错误");
            } catch (InstantiationException e) {
                System.out.println("实例化 JavaBean 失败");
            }
            return (T) obj;
        }

        /**
         * 将一个 JavaBean 对象转化为一个 Map
         * @param bean 要转化的JavaBean 对象
         * @return 转化出来的 Map 对象
         * @throws IntrospectionException 如果分析类属性失败
         * @throws IllegalAccessException 如果实例化 JavaBean 失败
         * @throws InvocationTargetException 如果调用属性的 setter 方法失败
         */
        @SuppressWarnings("rawtypes")
        public static Map toMap(Object bean) {
            Class<? extends Object> clazz = bean.getClass();
            Map<Object, Object> returnMap = new HashMap<Object, Object>();
            BeanInfo beanInfo = null;
            try {
                beanInfo = Introspector.getBeanInfo(clazz);
                PropertyDescriptor[] propertyDescriptors = beanInfo.getPropertyDescriptors();
                for (int i = 0; i < propertyDescriptors.length; i++) {
                    PropertyDescriptor descriptor = propertyDescriptors[i];
                    String propertyName = descriptor.getName();
                    if (!propertyName.equals("class")) {
                        Method readMethod = descriptor.getReadMethod();
                        Object result = null;
                        result = readMethod.invoke(bean, new Object[0]);
                        if (null != propertyName) {
                            propertyName = propertyName.toString();
                        }
                        if (null != result) {
                            result = result.toString();
                        }
                        returnMap.put(propertyName, result);
                    }
                }
            } catch (IntrospectionException e) {
                System.out.println("分析类属性失败");
            } catch (IllegalAccessException e) {
                System.out.println("实例化 JavaBean 失败");
            } catch (IllegalArgumentException e) {
                System.out.println("映射错误");
            } catch (InvocationTargetException e) {
                System.out.println("调用属性的 setter 方法失败");
            }
            return returnMap;
        }


    }
